To obtain a roof waterproof structure excellent in heat insulating properties and waterproofness by solving the problem that a long curing period is required, in a roof waterproofing method wherein a gap in a joint is sealed with an adhesive and a welding material so that a heat insulating material or a waterproof sheet are connected so as to be formed into a plane basically after the sufficient curing of roof slab concrete.

This structure can be used when moisture is retained in the roof slab concrete; the heat-insulating material with a base is arranged on a concrete surface; next, an anchor with a binding wire is driven from a small hole which is formed in advance in the heat insulating material, and connected to a reinforcing bar which is arranged on the surface of the heat insulating material so as to fix the heat insulating material; after that, a foaming agent is poured into a space below the heat insulating material from the small hole and foamed in the whole space to seal the space; and finally, protective mortar is applied to the top surface of the heat insulating material. Otherwise, the heat insulating material is superposed on a stone which surrounds a reinforced lath material provided on the top surface of a concrete skeleton, and after the superposition of the reinforced lath material, the foaming agent may also be poured for sealing.

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